684 BIOCHEMICAL RECURRENCE AFTER RADICAL PROSTATECTOMY: A CASE OF MULTIPLICATIVE INTERACTION BETWEEN SURGICAL MARGIN STATUS AND PATHOLOGICAL STAGE - Isbarn, H.; Eichelberg, C.; Budäus, L.; Chun, F.K.H.; Steuber, T.; Ahyai, S.A.; Fisch, M.; Schlomm, T.; Salomon, G.; Haese, A.; Heinzer, H.; Huland, H.; et al. (European Urology Supplements, 2010)